化学镀Ni-P与Sn-3.5Ag在钎焊及时效过程中的界面反映
首发时间:2009-06-10
摘要:近年来化学镀Ni-P作为优异的钎料扩散阻挡材料而广泛应用于电子封装中,其与无铅钎料之间的界面反应引起了研究者们的关注。本文主要研究了磷含量为6.5 wt.%的化学镀Ni-P层与Sn-3.5Ag钎料之间的润湿行为,以及Sn-3.5Ag/ Ni-P接头在钎焊和时效过程中的界面反应,结果表明250℃下直径为2.3±0.06mm的Sn-3.5Ag焊料球在化学镀Ni-6.5P表面钎焊后得到的润湿角约为44°,铺展率约为67%。钎焊界面由Ni3Sn4 IMC层、Ni3P晶化层及较薄的Ni-Sn-P过渡层构成,IMC的生长速率与钎焊时间t1/3呈线性规律。时效过程中界面IMC的生长速率与时效时间满足抛物线规律。
关键词: 化学镀Ni-P Sn-3.5Ag 界面反应 钎焊 时效
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Interfacial Reactions between Sn-3.5Ag Solder and Electroless Ni-P during Soldering and Aging
Abstract:Electroless Ni-P has a wide use and prospect in electronic packaging as an excellent diffusion barrier. The interfacial reactions between Sn-3.5Ag and electroless Ni-P film have attracted much research interest. In the present paper, the wetting behavior of Sn-3.5Ag solder on Ni-P film during soldering and the interfacial reactions between Sn-3.5Ag and Ni-6.5wt.%P during soldering and aging were investigated. The results showed that the wetting angle was about 44° and the spreading coefficient was about 67% using the solder balls of 2.3±0.06 mm in diameter. And the IMC microstructures were composed of a Ni3Sn4, a thinner Ni-Sn-P, a Ni3P crystallization layer and transition layer between Ni3Sn4 and Ni3P. The growth kinetics of interfacial IMC Ni3Sn4 during soldering followed a t1/3 law(t=reflowing time). The growth kinetics of interfacial IMC Ni3Sn4 during aging obeys a parabolic law of aging time.
Keywords: electroless Ni-P Sn-3.5Ag interfacial reaction soldering aging
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